Police are searching for vandals who threw stones at three passing buses in Binh Thuan Province early Friday, causing deep cuts to a toddler passenger's face.

All the three Ho Chi Minh City-bound buses reported to have been damaged in the incident, which occured at around 1.45 a.m., local media reported.

The 2-year-old boy, Nguyen Phan An Khang, sustained injuries near his right eyes after being hit by flying glass. Two other passengers were also injured in the incident.

Khang was rushed to a hospital in Ho Chi Minh City where doctors are treating his wounds.

Phan Minh Tuan, driver of one of the buses, said he and some passengers chased after some people standing in the area and caught two of them.

Shattered windows of a bus after some vandals threw stones at it. Photo credit: Tuoi Tre.

But a police officer of Binh Thuan said initial investigation found the two did not throw stones at the buses.

Rock throwing has been a scary experience to passengers traveling across central Vietnam.

The vandals, most of them young people, used to target trains, but have turned to buses in recent years after operators installed iron nets to protect train windows.

A court in central Vietnam early this month sentenced a 17-year-old boy to four years in jail for throwing stones at two buses running on a national highway, which caused a passenger to lose his left eye last September.

The man told the court that he had thrown stones at passing vehicles "just for fun."